Rubber Mixing Mill

The centrifugal pouring process for big size rolls is a recently developed pouring process.The notable advantages of rolls made by centrifugal pouring process vs rolls made by ordinary gravity pouring process are:

1).The chill cast shell and the inner part of the roll can be poured separately. Thus different composition of iron for the shell and for the inner part can be chosen freely according to different requirements.

2).The thickness and the hardness of the chill cast shell can be controlled more precisely and uniformly.

3).The molten iron is condensed under the centrifugal force.The surface of the shell is free from porosity, sand hole, slag inclusion, or other casting defects.

4).When the roll is made by ordinary gravity pouring process, there is always a layer of mottled iron formed between the white iron(chill cast iron) and the gray cast iron. When drilled roll is used, this mottled cast iron layer always makes the drilling very dificule.

When the roll is made by centrifugal pouring process, there is no mottled iron layer formed at all. The mottled iron layer problem no longer exists. The drilling can be done easily and precisely.

5).When proper materials are used and centrifugal pouring process is adopted. the hardness of the chill cast shell can hold as high as HS 74+/-2.The tensile strength of the roll can reach as high as 250 MPa. The working life of the roll made by centrifugal pouring process would be three to five times the working life of the rolls made by ordinary gravity pouring process.